200 CLASS XI. ORDER II. 



Flowers sessile, scattered, yellow. Capsule opening transversely. 

 Flowers all summer. — Annual. 



211. LYTHRUM. 



Lythrum vertigillatijm. L. Grass Poly. 



Leaves opposite or lernate, lanceolate, petioled; 

 flowers axillary, forming a sort of whorls. 

 Sijn. Decodox verticellatus. Ell. Hook. 



Stems woody at base, two feet high. Leaves opposite or in 

 threes, lanceolate, entire. Flowers on axillary, subdivided pe- 

 duncles, nearly surrounding the stem. Calyx ending in ten or 

 twelve teeth, accompanied by the same number of long stamens. 

 Petals five or six, of a fine purple, spreading, inserted on the ca- 

 lyx, short in duration. In watery places near Fresh pond. — 

 July, August. 



Lythrum hyssopifolium L. Dwarf Grass Poly. 



Leaves alternate, linear lanceolate ; flowers axilla- 

 ry, solitary, hexandrous. 



Stem slender, six to ten inches high, square with spreading 

 branches, which are mostly opposite, at base. Leaves linear ob- 

 long, obtuse, sessile, the lower ones deciduous. Flowers small, 

 axillary, sessile, appressed to the stalk, with three minute brac- 

 tes. Calyx subcylindrical, angular, with twelve minute seg- 

 ments, the alternate ones longer. Corolla small, purple. Sta- 

 mens commonly six, rarely five. — In low grounds and dried 

 ponds. — August, September. — Annual. 



This plant was returned to me by the late Dr. Muhlenberg as 

 L. lineare of Michaux. Are the two plants diSierent ? 



DIGYNIA. 



212. AGRIMONIA. 



Agrtmonia Eupatoria. L. Agrimony. 



Stem leaves pinnate, the odd one petioled, fruit 

 hispid. L. 



Rises to the height of two feet, with an angular, hairy stem. 

 Leaves uninterruptedly pinnate, hairy. Leafets ovate, serrate, 



